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                            选择器的基本意义是：根据一些特征，选中元素树上的一批元素。


简单选择器：针对某一特征判断是否选中元素。
复合选择器：连续写在一起的简单选择器，针对元素自身特征选择单个元素。
复杂选择器：由“（空格）”“ &gt;”“ ~”“ +”“ |
                            
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                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2021-04-12
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数组（Array）是一种线性表数据结构。它用一组连续的内存空间，来存储一组具有相同类型的数据。


线性表（Linear List）：数据排成像一条线一样的结构。每个线性表上的数据最多只有前和后两个方向。其实除了数组，链表、队列、栈等也是
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-04-08
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                                alt="「Algorithm」复杂度分析">
                            
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                            复杂度分析方法数据结构和算法本身解决的是“快”和“省”的问题，即如何让代码运行得更快，如何让代码更省存储空间（“如何让计算机更快时间、更省空间的解决问题”）。
复杂度：时间和空间复杂度。

事后统计法：运行代码后，通过统计、监控，就能得到算
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-04-07
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                            文法是编译原理中对语言的写法的一种规定，一般来说，文法分成词法和语法两种。

词法规定了语言的最小语义单元：token，可以翻译成“标记”或者“词”。词法分析技术上可以使用状态机或者正则表达式来进行。

词法分类：

WhiteSpace 
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-04-01
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                                <a href="/categories/JavaScript/" class="post-category">
                                    JavaScript
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                            <span class="card-title">「大前端」at rule &amp; qualified rule</span>
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                            at-rule
@charset  ： https://www.w3.org/TR/css-syntax-3/
@import  ： https://www.w3.org/TR/css-cascade-4/
@media  ： https:
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-24
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                                    CSS/Less
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                                alt="「大前端」实践">
                            
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                            性能
while 循环快还是 for 循环快？|0 是不是比 Math.floor 性能好？

一切没有 profiling 的性能都是耍流氓。凡是真正有价值的性能优化，必定是从端到端的业务场景建立体系来考虑的。
性能体系的建立可以分成以下
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-11
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                                <a href="/categories/%E5%A4%A7%E5%89%8D%E7%AB%AF/" class="post-category">
                                    大前端
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                                alt="「大前端」语句">
                            
                            <span class="card-title">「大前端」语句</span>
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                            比较常见的语句包括变量声明、表达式、条件、循环等。
Completion 类型q: 在 try 中有 return 语句，finally 中的内容还会执行吗？
function foo() &#123;
  try &#123;
    r
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-11
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                                    JavaScript
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                                alt="「大前端」面向对象的JS？">
                            
                            <span class="card-title">「大前端」面向对象的JS？</span>
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                            面对对象 or 基于对象
Object：一切事物的总称。基于对象：语言和宿主的基础设施由对象来提供，并且 JavaScript 程序即是一系列互相通讯的对象集合。

对象的特点（标识性、状态和行为）：
对象具有唯一标识性：即使完全相同的两个
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-11
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                                alt="「大前端」执行中都发生了什么">
                            
                            <span class="card-title">「大前端」执行中都发生了什么</span>
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                            Promise or setTimeOut得到一段 JS 代码时，浏览器或者 Node 环境首先要做的就是；传递给 JavaScript 引擎，并且要求它去执行。但是宿主环境当遇到一些事件时，会继续把一段代码传递给 JavaScript 引
                            
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                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-11
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                                    JavaScript
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                                alt="「Daily」interview list">
                            
                            <span class="card-title">「Daily」interview list</span>
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原始类型有哪几种？null 是对象嘛？
对象类型和原始类型的不同之处？函数参数是对象会发生什么问题？
typeof 是否能正确判断类型？instanceof 能正确判断对象的原理是什么？
如何正确判断 this？箭头函数的 this 是什
                            
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                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-08
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                                alt="「大前端」JS Type">
                            
                            <span class="card-title">「大前端」JS Type</span>
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                    <div class="card-content article-content">
                        <div class="summary block-with-text">
                            
                            
为什么有的编程规范要求用 void 0 代替 undefined？
字符串有最大长度吗？
0.1 + 0.2 不是等于 0.3 么？为什么 JavaScript 里不是这样的？
ES6 新加入的 Symbol 是个什么东西？
为什么给对象
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-08
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                                <a href="/categories/JavaScript/" class="post-category">
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                                alt="「大前端」知识框架">
                            
                            <span class="card-title">「大前端」知识框架</span>
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-03-08
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                                <a href="/categories/%E5%A4%A7%E5%89%8D%E7%AB%AF/" class="post-category">
                                    大前端
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                            </span>
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                            <span class="chip bg-color">前端</span>
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                            原始类型原始类型存储的都是值，是没有函数可以调用的。&#39;1&#39;.toString() ，其实在这种情况下，&#39;1&#39;  已经不是原始类型了，而是被强制转换成了  String类型也就是对象类型，所以可以调用  toS
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-02-23
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                                    JavaScript
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                            <img src="/medias/featureimages/cover-bg-7.jpg" class="responsive-img"
                                alt="「日本語」 李さんの手紙">
                            
                            <span class="card-title">「日本語」 李さんの手紙</span>
                        </div>
                    </a>

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                            小野さん
私は　今　京都に　います。一昨日、新幹線で　来ました。京都は　今　紅葉もみじが　とても　綺麗ですよ。京都の紅葉は　本当に　素晴らしいすばらしいですね。私は　日本の季節の中で　秋が　一番　好きです。小野さんは　どうですか？京都には　
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2021-01-28
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                                <a href="/categories/%E6%97%A5%E6%9C%AC%E8%AA%9E/" class="post-category">
                                    日本語
                                </a>
                                
                                
                            </span>
                        </div>
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                        <a href="/tags/%E6%97%A5%E6%9C%AC%E8%AA%9E/">
                            <span class="chip bg-color">日本語</span>
                        </a>
                        
                    </div>
                    
                </div>
            </div>
            
            <div class="article col s12 m6 l4" data-aos="zoom-in">
                <div class="card">
                    <a href="/2020/12/26/todolist-template/">
                        <div class="card-image">
                            
                            
                            <img src="/medias/featureimages/cover-bg-5.jpg" class="responsive-img"
                                alt="「手帳」todolist模版">
                            
                            <span class="card-title">「手帳」todolist模版</span>
                        </div>
                    </a>

                    <div class="card-content article-content">
                        <div class="summary block-with-text">
                            
                            
部分计划表模版

日计划表Daily TODO 01

Tasks：今日任务
Date：本日日期
Target：本日目标
Time Tracker：本日日程时间表（10分钟为单位）
Summary：今日总结
Graph：今日日程时间安排分
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2020-12-26
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                                <i class="fas fa-bookmark fa-fw icon-category"></i>
                                
                                <a href="/categories/%E6%89%8B%E5%B8%B3/" class="post-category">
                                    手帳
                                </a>
                                
                                
                            </span>
                        </div>
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                        <a href="/tags/%E6%89%8B%E5%B8%B3/">
                            <span class="chip bg-color">手帳</span>
                        </a>
                        
                        <a href="/tags/TODO/">
                            <span class="chip bg-color">TODO</span>
                        </a>
                        
                    </div>
                    
                </div>
            </div>
            
            <div class="article col s12 m6 l4" data-aos="zoom-in">
                <div class="card">
                    <a href="/2020/12/23/yuque/oe1ft6/">
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                            <img src="/medias/featureimages/cover-bg-3.jpg" class="responsive-img"
                                alt="「CSS」CSS那些事">
                            
                            <span class="card-title">「CSS」CSS那些事</span>
                        </div>
                    </a>

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                        <div class="summary block-with-text">
                            
                            各种选择器
指定特定元素对其进行样式加工;





选择器
说明
版本




基础选择器




tag
类型选择器
1


#id
id 选择器
1


.class
类选择器
1


*
通配选择器
2


层级选择器




el
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2020-12-23
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                                <a href="/categories/CSS-Less/" class="post-category">
                                    CSS/Less
                                </a>
                                
                                
                            </span>
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                        <a href="/tags/css/">
                            <span class="chip bg-color">css</span>
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                            <img src="/medias/featureimages/cover-bg-8.jpg" class="responsive-img"
                                alt="「JS」数组遍历方法">
                            
                            <span class="card-title">「JS」数组遍历方法</span>
                        </div>
                    </a>

                    <div class="card-content article-content">
                        <div class="summary block-with-text">
                            
                            
forEach
map
filter
find
reduce

forEachlet arr = [1, 2, 3, 4];
arr.forEach((item) => &#123;
  console.log(item + 1);
&#
                            
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                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2020-10-13
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                                <a href="/categories/JavaScript/" class="post-category">
                                    JavaScript
                                </a>
                                
                                
                            </span>
                        </div>
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                        <a href="/tags/js/">
                            <span class="chip bg-color">js</span>
                        </a>
                        
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            <div class="article col s12 m6 l4" data-aos="zoom-in">
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                    <a href="/2020/10/13/yuque/hr2ubu/">
                        <div class="card-image">
                            
                            
                            <img src="/medias/featureimages/cover-bg-0.jpg" class="responsive-img"
                                alt="「JS」闭包">
                            
                            <span class="card-title">「JS」闭包</span>
                        </div>
                    </a>

                    <div class="card-content article-content">
                        <div class="summary block-with-text">
                            
                            
闭包是指有权访问另外一个函数作用域的变量的函数。——《JavaScript 高级程序设计》

闭包的特点首先是函数，其次是它可以访问到父级作用域的变量对象，即使父级函数完成调用后”理应出栈销毁“。

闭包是指那些能够访问自由变量的函数。—
                            
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                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2020-10-13
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                                <i class="fas fa-bookmark fa-fw icon-category"></i>
                                
                                <a href="/categories/JavaScript/" class="post-category">
                                    JavaScript
                                </a>
                                
                                
                            </span>
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                        <a href="/tags/js/">
                            <span class="chip bg-color">js</span>
                        </a>
                        
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            <div class="article col s12 m6 l4" data-aos="zoom-in">
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                    <a href="/2020/10/12/yuque/nsgoo9/">
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                            <img src="/medias/featureimages/cover-bg-5.jpg" class="responsive-img"
                                alt="「JS」ES6新增特性">
                            
                            <span class="card-title">「JS」ES6新增特性</span>
                        </div>
                    </a>

                    <div class="card-content article-content">
                        <div class="summary block-with-text">
                            
                            
表达式：声明、解构赋值
内置对象：字符串扩展、数值扩展、对象扩展、数组扩展、函数扩展、正则扩展、Symbol、Set、Map、Proxy、Reflect
语句与运算：Class、Module、Iterator
异步编程：Promise、G
                            
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                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2020-10-12
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                                <i class="fas fa-bookmark fa-fw icon-category"></i>
                                
                                <a href="/categories/JavaScript/" class="post-category">
                                    JavaScript
                                </a>
                                
                                
                            </span>
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                        <a href="/tags/js/">
                            <span class="chip bg-color">js</span>
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            <div class="article col s12 m6 l4" data-aos="zoom-in">
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                    <a href="/2020/10/10/yuque/ug30tr/">
                        <div class="card-image">
                            
                            
                            <img src="/medias/featureimages/cover-bg-4.jpg" class="responsive-img"
                                alt="「JS」作用域">
                            
                            <span class="card-title">「JS」作用域</span>
                        </div>
                    </a>

                    <div class="card-content article-content">
                        <div class="summary block-with-text">
                            
                            
作用域：负责收集并维护由所有声明的标识符（变量）组成的一系列查询，并实施一套非常严格的规则，确定当前执行的代码对这些标识符（变量）的访问权限。——《你不知道的 JavaScript 上卷》

参考教程：前端进击的巨人（三）：从作用域走进闭
                            
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                                <i class="far fa-clock fa-fw icon-date"></i>2020-10-10
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